BR112012000649B1 - LANCET AND PUNCHING SYSTEM - Google Patents

Abstract

lancet and punching system. the present invention relates to a lancet with a flat handle (1), which has an upper side (1c) and a lower side (1b), where the handle (1) forms at a front end 2 a blade (1a ), which ends at one end (2), the blade (1a) has two cutting edges on the bottom (1b), which converge at the end (2), and the handle (1) has on its bottom side (1b) at least one recess (3) for receiving a sample. the invention provides that the handle (1), on its upper side (1c), passes to the blade (1a) on two edges (5), which converge at a vertex (6), and that the upper side (1c) of the blade (1a) is convexly curved, seen in cross section, between the vertex (6) and the anterior end (2).

Description

Descriptive Report of the Invention Patent for LANCET AND PUNCHING SYSTEM.

DESCRIPTION [0001] The present invention relates to a lancet with the characteristics indicated in the preamble of claim 1. Such a lancet is known from WO 2005/084545 A1.

[0002] A constant goal in the development of lancets is to enable sample withdrawal while minimizing pain as much as possible. It is the task of the present invention to indicate a way in which this object can be achieved even better.

[0003] This task is solved by a lancet with the characteristics indicated in claim 1. Advantageous improvements of the invention are subject to subordinate claims.

[0004] A lancet according to the invention has a flat cable, which has an upper side and a lower side, which are connected to each other through narrow sides that extend in the longitudinal direction of the cable. Such a cable can be produced, for example, from sheet metal, with little complexity. The handle of a lancet according to the invention forms at a front end a blade, which ends at one end. On the underside, the cable comprises at least one recess for receiving a sample. This recess is preferably formed as a groove. Instead of or in addition to a groove, recesses with other shapes, for example, blind holes, can also be arranged on the underside of the cable.

[0005] In a lancet according to the invention, the blade is limited on the upper side by two edges, which converge at a vertex. The upper side of the blade is convexly curved, seen in cross section between the apex and the anterior end. Between the apex and the anterior end, the blade therefore has an upper side

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2/16 rior rounded convexly, seen transversely to the longitudinal direction.

[0006] The special shape of a blade according to the invention makes it possible to drill with less pain than is possible with the lancets known from WO 2005/084545 A1, whose blades are limited by flat surfaces and a single upper edge, which extends perpendicular to the longitudinal direction of the cable.

[0007] The surprisingly advantageous properties of a lancet according to the invention can probably be attributed to the fact that the formation of painful pressure waves can be prevented to the greatest extent possible when drilling. Upon penetration of a lancet according to the invention into a patient's body tissue, a perforation channel is generated, which is gently expanded to the thickness of the lancet cable by the upper convex side of the blade. As the blade is limited by two converging edges on the upper side and, seen in cross section, the upper side of the blade is convex between the apex and the anterior end, the drilling channel is initially expanded to the total thickness of the lancet only about a part of its width. Upon further penetration of the lancet, the drilling channel is then extended to the full thickness of the lancet cable over an increasingly larger part of its width. This is an essential improvement over the lancet known from WO 2005/084545 A1, in which the drilling channel, when reaching full thickness at the same time, is also expanded to full width.

[0008] Since the thickness and width of a lancet are finite, it is inevitable that in a perforation, pressure is also exerted across the direction of the perforation on surrounding tissue. In a lancet according to the invention, this pressure is advantageously exerted, practically exclusively, by the upper side

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3/16 convex of the blade and the upper side of the handle adjacent to it. This probably leads to the fact that the tissue supported against the underside of the cable is compressed less strongly and, for this reason, body fluid can leak particularly easily from the tissue supported against the underside of the cable and can fill the recess provided for receive the sample on the underside of the cable.

[0009] An advantageous enhancement of the invention provides that the blade is concave formed along a line extending from the apex to the anterior end. This measure helps to further reduce the pain associated with a perforation. That is, in this way, the thickness of the blade, seen from the tip, initially increases only relatively slowly and, subsequently, more rapidly. Therefore, the thickness of the blade is reduced in an anterior region. It is assumed that, in the case of a perforation, the body tissue initially opposes a higher resistance to the lancet, which decreases as the lancet advances. With a blade formed in accordance with the invention, the force required for a lancet to penetrate body tissues and thus the pain sensation is also advantageously reduced. Preferably, the lancet blade according to the invention is concave in the longitudinal direction and convex in the transverse direction.

[00010] The apex is preferably located, as well as the tip, in the center of the cable width. However, it is also possible to arrange the vertex and / or the point offset from the center, so that the two cutting edges or the two upper edges of the blade have different lengths. In this case, the line extends from the apex to the front end not exactly in the longitudinal direction of the cable, but slightly inclined to it.

[00011] Another enhancement of the invention provides that the upper edges of the blade extend further back than the edges of

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4/16 cut. In this way, the pain associated with a perforation can be further reduced. The blade is limited, in this chaos, preferably by lateral edges, which connect the rear end of a cutting edge with the rear end of one of the upper edges. The lateral edges, preferably with a lower edge of the handle, extended behind the blade, at an acute angle, which can be, for example, 10 ° to 60 °, particularly between 15 ° and 35 °.

[00012] Another advantageous improvement of the invention provides that the recess provided for receiving samples is formed as a groove. Preferably, this groove ends at a distance from the front end of the cable, storage, between the apex and the front end of the cable. Particularly preferably, the groove has a section, which is disposed between the cutting edges and in which the cross-sectional area of the groove decreases towards the front end. The groove cross-sectional area can be reduced in the blade area by a reduction in the groove width or depth, preferably both in width and depth. Preferably, the cross-sectional area, i.e., the width and / or the depth, decreases over a length, which is greater than the maximum slot width. In this way, the groove can get closer to the anterior edge of the blade, without impairing the mechanical stability of the blade.

[00013] Preferably, at the end of the groove, the blade is less than two thirds, preferably not more than half, the thickness of the handle. Particularly preferably, the blade at the end of the groove is less than two thirds, preferably not more than half, the width of the handle. Behind the blade, the depth of the groove is preferably more than half the thickness of the cable.

[00014] For a transport of liquid by capillary forces, it is usually necessary that the cross section of the capillary does not increase,

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5/16 because the penetration of a fluid in a growing capillary means an enlargement of the contact surface between liquid and air and, for this reason, it is energetically unfavorable. For this reason, it could be assumed that a thin section of the groove cannot contribute to the sample removal. But, surprisingly, that is not the case. When the groove has a cross-sectional area that decreases towards one end of the blade, the depth of the perforation for taking a sample can be reduced. For this reason, taking a sample with a lancet according to the invention is associated with less pain.

[00015] For this reason, the aspect of the invention that provides for a groove on the underside of the lancet, whose cross-sectional area decreases towards the front end, is also of independent importance. For this reason, the present invention also relates to a lancet with a flat handle, which has an upper side and a lower side, the handle forming a blade at the front end, which ends at one end, the blade comprises two edges with cutting edges on the bottom side, which converge at the tip, and the cable has at least one groove on the underside for taking samples, with the groove having a section disposed between the cutting edges, in which the section area of the groove decreases towards the front end. Preferably, the cross-sectional area decreases by a length, which is greater than the width of the groove, particularly preferably, greater than the thickness of the cable, particularly greater than the width of the cable.

[00016] An advantage of a lancet according to the invention, with a sampling groove located on the underside of the cable, consists, in particular, also in the fact that the risk of an obstruction of the groove or a damage to a coating

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6/16 hydrophilic contained in the groove is reduced.

[00017] Preferably, a lancet according to the invention is made of metal, preferably of steel. As a lancet handle, a strip of sheet metal is used. By caustication, preferably chemical wetting, the slide and one or more recesses for sample reception can be formed. For this purpose, a strip of sheet metal can be coated on all sides with photoresist. By proper exposure and subsequent washing, the photoresist on the underside can be removed where at least one recess must be formed for receiving samples. On the upper side, the photoresist can be removed across the region in front of two V-shaped lines, which subsequently form the upper edges of the slide. Additionally, the photoresist can be removed on the narrow sides, in the region in front of a line extended from top to bottom, which subsequently forms a lateral limiting edge of the blade. By the subsequent action of a causticizing agent, the form according to the invention of the blade can then be produced. Alternatively, however, a lancet according to the invention can be produced by means of laser cutting.

[00018] Advantageously, with a lancet according to the invention, a sample can be taken from under the skin. The risk of contamination on the skin surface can therefore be avoided. This is an important advantage, particularly in determining the concentration of glucose, since sugar often occurs on the skin, for example, after consuming sweet foods. In order to be able to take a sample from under the skin, puncture devices can be advantageously used, in which the return movement of the lancet occurs more slowly than the forward movement. Apparatus with appropriate punching drives are described in EP 1 709 906 A1 and US 2008/026388

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7/16

TO 1.

[00019] One aspect of the present invention relates, therefore, to a puncture system with a lancet according to the invention and a puncture apparatus, which in a puncture causes an advance movement of the lancet and a movement of subsequent return, the return movement occurring at a lower speed than the forward movement. In a first section of the return movement, the move is preferably withdrawn at a higher speed than in a subsequent second section. Thus, the lancet remains only in body tissue sensitive to pain for as short a time as possible, but remains in body tissue insensitive to pain, for example, the stratum corneum layer of the epidermis for an extended period of time for removal of sample.

[00020] A lancet according to the invention can be formed in such a way that in the case of a puncture through body tissue, its blade is deviated transversely to the direction of the puncture and curved towards its underside. In the return movement, a cavity is then formed between the underside of the blade and the tissue, the said cavity being quickly filled with body fluid. During the slow return movement or during the slow section of the return movement, the recess arranged on the underside of the lancet can advantageously receive a sample. The formation of a cavity between the underside of the blade and the surrounding body tissue can also be caused or favored by a displacement or compression of tissue that occurs during the puncture.

[00021] A lancet that curves in the punch, which on its underside has a recess for receiving samples, therefore allows for an improved sample reception. One aspect of the invention, which may also be of independent importance, concerns,

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8/16 therefore, to a lancet with a flat handle, which has an upper side and a lower side, with the handle forming a blade at the front end, which ends at one end, the blade has two edges at the bottom cut, which converge at one end, and the cable has at least one recess in its underside for receiving samples, and the cable has a flexural stiffness of less than 0.1 kNmm ² (kilonewton multiplied per square millimeter), preferably less than 0.05 kNmm ² , especially 0.03 to 0.001 kNmm ² ..

[00022] Flexural stiffness is the product of the material's modulus of elasticity and the geometric moment of inertia of the lancet handle. In a cable with a rectangular cross section, the geometric moment of inertia makes I = a ³ b / 12, where a is the cable thickness and b is the cable width. In a flat lancet with a rectangular cross section, the geometric moment of inertia and, therefore, the flexural stiffness, is somewhat reduced due to the groove.

[00023] Preferably, the cable is metal, particularly steel. But, as an alternative, plastic can also be used. Preferably, the cable has a width of less than 0.5 mm, for example, between 0.2 mm and 0.4 mm. The thickness of the cable is preferably at most 0.3 mm, particularly preferably between 0.2 mm and 0.05 mm, especially between 0.20 mm and 0.08 mm.

[00024] Other details and advantages of the invention are explained through examples of modality, with reference to the attached drawings. Equal and corresponding parts are characterized, in this case, with identical reference numbers. They are shown:

figure 1 shows an example of a lancet according to the invention, seen from below;

figure 2 is a side view of figure 1;

figure 3 the lancet shown in figure 1, in top view;

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9/16 figure 4 is an inclined view of the lancet;

figure 5 is a cross section along the cut line AA of figure 3;

figure 6 is a cross section along the BB line of figure 3;

figure 7 is a cross section along the CC line of figure 3;

figure 8 is a cross section along the DD cut line of figure 3;

figure 9 is a cross-section along the line EE of figure 3;

figure 10 is a cross-section along the cut line FF of figure 3;

figure 11 is a cross-section along the line GG of figure 3;

figure 12 shows an example of a lancet according to the invention in piercing a sterile protective film;

figure 13 shows an example of a lancet according to the invention on a carrier tape;

figure 14 shows another example of a lancet modality according to the invention;

figure 15 is a sectional view of figure 14;

figure 16 shows another example of a lancet modality according to the invention;

figure 17 is a sectional view of figure 16;

figure 18 shows another example of a lancet modality according to the invention; and figure 19 is a sectional view of figure 18.

[00025] The lancet shown schematically in figures 1 to 11 has a flat handle 1, which at its anterior end forms a blade 1a, which ends at a tip 2. The handle 1 has a lower side 1b, shown in figure 1, and an upper side, shown in figure 3. The lower side 1b and the upper side 1c are connected to each other by means of narrow sides 1d, which extend in the longitudinal direction of the cable 1.

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10/16 [00026] The cable 1 has on its lower side 1b a recess 3, for receiving the sample. This recess 3 is preferably formed as a groove. However, several recesses can also be used, which are arranged, for example, as blind holes on the underside 2.

[00027] The blade 1a has two lower edges, which converge at the tip 2. These lower edges are formed as cutting edges

4. In the example shown, the cutting edges 4 converge in a wedge shape and form an acute angle. Preferably, the cutting edges 4 form an angle of less than 60 °, preferably less than 45 °, particularly an angle of less than 40 °. The angle formed between the two cutting edges 4 is preferably at least 20 °, particularly preferably at least 25 °.

[00028] In addition to the two cutting edges 4, the blade 1a has two upper edges 5, which converge at a vertex 6. Therefore, the blade 1a is limited on the upper side 1c by the two upper edges 5, which converge in the shape of a wedge , and on the lower side 1b, by the cutting edges 4, which converge in the shape of a wedge. The upper edges 5 and the cutting edges 4, in the example of the embodiment shown, extend in parallel, but can also form different angles. Preferably, the upper edges 5 form an acute angle. In the example of embodiment shown, this angle is less than 60 °, for example, 10 ° to 50 °, especially 20 ° to 45 °.

[00029] The apex 6 is preferably located behind the tip 2, for more than the thickness of the cable 1. The distance component between the apex 6 and the tip 2, measured in the longitudinal direction of the cable 1,

i.e., the end point of the lancet, therefore, preferably makes up more than the thickness of the cable 1. Particularly preferably, in the

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11/16 As an example of the modality shown, the vertex 6 is arranged behind the tip 2, for more than twice the thickness of the cable 1. Preferably, the width of the cable is two to three times its thickness.

[00030] The upper edges 5 extend further back than the cutting edges 4. The blade 1a is limited laterally on both sides, in each case, by an edge 7, which connects the rear end of a cutting edge 4 with the rear end of an upper edge 5. Edge 7 forms with the lower edge of the narrow side arranged on its side, preferably an acute angle, for example, an angle between 10 ° and 60 °, especially between 15 ° and 35 °. With the cutting edge 4 arranged on its side, the edge 7 can form an obtuse angle.

[00031] In this case, it can be seen in figure 2 that the blade is concave formed along a line that extends from the vertex 6 to the anterior end 1. The upper side 1b is notched in the vertex 6.

[00032] Figures 5 to 11 show a series of cross sections of the lancet along the cut lines shown in figure 3. In this case, figure 5 already shows a sectional view along the cut line AA, figure 6, along the BB cut line, figure 7, along the CC cut line, figure 8, along the DD cut line, figure 9, along the EE cut line, figure 10, along cut line FF and figure 11, along the cut line GG.

[00033] In figures 5 to 7 it can be seen that the upper side of the blade 1a, seen in cross section, is convex, between the vertex 6 and the anterior endpoint 2. Figures 5 to 7 also show, in this case, that the cutting edges 4 have a cutting angle that decreases towards the anterior end 2. The cutting angle decreases, in this case, continuously towards the anterior end 2. This leads to the fact that the puncture channel produced in a puncture in

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12/16 lancet in a patient's body tissue is continuously thicker and wider, which is advantageous for a puncture with reduced pain.

[00034] Figures 8 to 10 show that the blade 1a has side surfaces formed in a concave manner, particularly between the vertex 6 and the rear end of the cutting edges 4.

[00035] The bottom side 1b of the cable is flat or concave. Figures 5 to 11 show, in this case, that the lower side 1b of the handle 1, particularly the lower side of the blade 1a, is flat on both sides, in an edge region. Regardless of the recess 3 for receiving the sample, the entire bottom side 1b of the cable is flat. The recess 3 leads to the fact that the lower side 1b of the cable 1 is concave in the corresponding region.

[00036] In a lancet according to the invention, the lower side 1b, between the anterior end 2 and the apex, or even the entire lower side of the blade 1a, can be free of recesses 3 for receiving samples. Preferably, however, the recess 3 also extends in the region of the blade 1a. In order to minimize the puncture depth, necessary for obtaining a sample, it is generally advantageous when the recess 3 extends on the lower side 1b into the region between the vertex 6 and the anterior end 2. In order not to impair the mechanical stability of the blade 1a, in general, is advantageous when the groove 3 ends at a distance from the front end 2. In such a groove 3, arranged on the bottom side 1b of the cable, it is advantageous that when drilling a sterile protector it is not obstructed by the sterile protector material.

[00037] In the example shown, the groove 3 extends beyond the vertex 6. In figure 1 it can be seen, in this case, that the groove 3 narrows continuously in a section in the region of the blade 1a. The length of the section that narrows is,

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13/16 case, greater than the maximum width of the groove 3. In the total narrowing section, the depth of the groove 3 decreases continuously towards the anterior end. Therefore, the cross-sectional area of the groove, decreases in the section disposed between the cutting edges 4. [00038] The maximum width of the groove 3, therefore, the width of the groove behind the blade 1a, is preferably less than half the width of the cable. The maximum depth of the groove, therefore the depth of the groove behind the blade 1a, is preferably more than half the thickness of the handle. The thickness of the cable must be less than 0.3 mm and is preferably between 80 qm and 200 qm, particularly preferably between 80 qm and 180 qm. The width of the body can be, for example, between 0.2 mm and 0.5 mm, preferably 20 mm to 400 mm.

[00039] Steel is preferred as material, particularly fine steel. The flexural stiffness of the lancet cable should not exceed 0.1 kNmm ² , preferably less than 0.05 kNmm ² , particularly preferably less than 0.02 kNmm ² . Values from 0.01 to 0.001 kNmm ² are particularly advantageous.

[00040] Lancets with such small flexural stiffness are elastically curved when punctured in body tissue. The lower side of the lancet is, in this chaos, the internal side of the flexion, so that at the return of the lancet, a cavity filled with body liquid is formed on the bottom side of the groove 3. By flexing the lancet, therefore, sample reception is improved.

[00041] An example of a lancet modality according to the invention in piercing a sterile protective film 10, which can be, for example, a metallic film, particularly an aluminum film, a film plastic or a metal film coated with plastic or a plastic film coated with metal. With this sterile protective film 10 it can be closed, for

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14/16 example, a lancet cartridge chamber, to protect a lancet arranged in it against harmful environmental influences. As in a lancet according to the invention, the groove 3 for receiving the sample is arranged on the underside of the cable, the groove 3 is not affected by the perforation of the sterile protective film 10. The cutting edges 4 of the lancet cause the sterile protective film 10 is cut on the lower side of the lancet, parallel to the lower side of the cable, so that the occurrence of film residues which could block the groove 3 is prevented. Advantageously, parts of the perforated sterile protective film 10 protrude into the groove, and by sliding along a surface of the groove 3, damage a hydrophilic coating, preferably there.

[00042] Instead of disposing a lancet according to the invention in a cartridge chamber closed with a sterile protective film 10, the lancets according to the invention can also be arranged on a carrier tape, as it is known, for example from WO 2008/083844 A1. Preferably, a lancet according to the invention is arranged with its upper side on a carrier tape and its lower side is covered with a sterile protective film. Figure 13 shows an example of a corresponding modality, with a carrier tape 11, a lancet and a sterile protective film 10, in a sectional view.

[00043] The sterile protective film 10 is thinner than the support tape 11, preferably at most half thick. The sterile protective film 10 is loosely supported on the lancet and is connected by joining materials, for example, glued or welded. The lancet cable 1 can be glued with the carrier tape in a posterior region, away from the blade 1a. In a previous region, the lancet cable 1 is loosely supported on the tape by

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15/16 so that, for a puncture, the blade 1a can be released from the sterile protective film by flexing the carrier tape, as described in WO 2008/083844 A1.

[00044] Figure 14 shows another example of a lancet modality and figure 15, a corresponding sectional view, along the cut line HH. This lancet differs from the lancet in figures 1 to 11 only in that the recess 3 for sample reception is formed as a slightly wider groove. This makes it possible to receive larger sample volumes.

[00045] Figure 16 shows another example of a lancet modality and figure 17, a corresponding sectional view, along the KK cut line. This lancet differs from the lancet in Figures 14 and 15 in that, instead of a single recess 3 formed as a groove, two recesses 3 formed as a groove are present, extended in parallel. The dividing wall 12 between the two recesses 3 reduces the total volume of the two recesses 3 only insignificantly, but leads to substantially greater capillary forces. The two recesses 3 of the modality example shown in figure 16, therefore, fill up more quickly with body fluid than a recess of the modality example shown in figures 14 and 15.

[00046] Figure 18 shows another example of a lancet modality and figure 19 a corresponding sectional view along the cut line LL. This lancet differs from the modality example in figure 18 only in that the dividing wall 12 between the recesses 3 is reduced. The two recesses 3 are therefore connected on the surface, but inside they are divided by the dividing wall 12 into two parallel channels. The dividing wall 12 also leads to an increase in capillary forces and, therefore, to a faster filling of the recess 3.

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16/16

REFERENCE LISTING cable

1st blade

1b bottom side

1c top side

1d narrow side tip recess cutting edge top edge apex side limiting edge side surfaces sterile protective film carrier tape partition wall

Claims (21)

1. Lancet with a flat handle (1), which has an upper side (1c) and a lower side (1 b), where: the handle (1) forms a blade (1a) at an anterior end (2), which ends at one end (2), the blade (1a) has two cutting edges (4) on the underside (1b), which converge at the end (2), and the cable (1) has on its lower side (1b) at least one recess (3) for receiving samples, characterized by the fact that the cable (1), on its upper side (1c) , passes to the blade (1a) on two edges (5), which converge at a vertex (6), and that the upper side (1c) of the blade (1a) is convexly curved, seen in cross section, between the vertex (6) and the anterior end (2). 2. Lancet according to claim 1, characterized by the fact that the blade (1a) is concave formed along a line extending from the apex (6) to the anterior end (2). 3. Lancet according to claim 1, characterized by the fact that the upper side (1c) has a notch in the apex (6). 4. Lancet according to claim 1, characterized by the fact that the blade (1a) has lateral surfaces (8) formed in a concave manner between the vertex (6) and the posterior end of the cutting edges (4). 5. Lancet according to claim 1, characterized by the fact that the two edges (5), which limit the blade (1a) on the upper side (1c), extend parallel to the cutting edges (4). 6. Lancet according to claim 1, characterized Petition 870190082025, of 08/22/2019, p. 21/49 2/4 due to the fact that the vertex (6) is arranged for more than the thickness of the cable (1) behind the tip (2). 7. Lancet according to claim 1, characterized by the fact that the two edges (5), which limit the blade (1a) on the upper side (1c), form an acute angle. 8. Lancet according to claim 1, characterized by the fact that the cutting edges (4) have a cutting angle, which decreases towards the anterior end (2). 9. Lancet according to claim 1, characterized by the fact that the lower side (1b) of the blade (1a) is flat, at least in an edge region, which extends along the cutting edges (4). 10. Lancet according to claim 1, characterized by the fact that the bottom side (1b) of the cable (1) is flat, exclusive of the recess (3) for receiving the sample. 11. Lancet according to claim 1, characterized by the fact that the upper edges (5) extend further back than the cutting edges (4). 12. Lancet according to claim 1, characterized by the fact that the recess (3) is a groove, which extends beyond the vertex (6) and has a section disposed between the cutting edges (4), in said section the cross-sectional area of the groove (3) decreases towards the front end (2). 13. Lancet according to claim 1, characterized by the fact that the handle (1) has a flexural stiffness of less than 0.1 kNmm ² . 14. Puncture system, characterized by the fact that it comprises a lancet as defined in any one of claims 1 to 13 and a puncture device, which in the case of a puncture, produces a forward movement of the lancet and a movement Petition 870190082025, of 08/22/2019, p. 22/49 3/4 subsequent return movement, in which the return movement is slower than the forward movement. 15. Lancet according to claim 13, characterized by the fact that the handle (1) has a flexural stiffness of less than 0.05 kNmm ² . 16. Lancet according to claim 13, characterized by the fact that the handle (1) has a flexural stiffness of less than 0.03 to 0.01 kNmm ² . 17. Lancet according to claim 1, characterized by the fact that at least one recess includes two grooves (3) that extend parallel to each other to receive a sample. 18. Lancet according to claim 17, characterized in that the groove (3) has a section disposed between the cutting edges (4), in which the cross-sectional area of the groove (3) decreases towards the end previous (2). 19. Lancet with a flat handle (1), which has an upper side (1c) and a lower side (1b), in which the handle (1) forms a blade (1a) at an anterior end (2), which ends at one end (2), the blade (1a) has cut edges (4) on the bottom side (1b), which converge at the end (2), and the handle (1) has at least the bottom side (1b) a groove (3) for receiving the sample, characterized by the fact that the groove (3) has a section disposed between the cutting edges (4), in which the cross-sectional area of the groove (3) decreases towards the end front (2), where the groove has a depth, where the depth of the groove decreases along the front end, where the Petition 870190082025, of 08/22/2019, p. 23/49 4/4 handle (1), on its upper side (1c), passes to the blade (1a) on two edges (5), which converge at a vertex (6), and the groove (3) extends beyond the vertex (6). 20. Lancet according to claim 19, characterized by the fact that at least one recess (3) includes two grooves (3) that extend parallel to each other for receiving the sample. 21. Lancet according to claim 19, characterized in that the thickness of the blade is less than two thirds of the thickness of the blade at the front end (2) of the groove (3).